No heater or A/C blower

a couple of things to check fuse check each fan.speed unplug the wire to the blower motor and check for power the blower motor resistor could be bad or blower.motor.

If you flushed the coolant with the thermostat in, chances are you didn't flush the coolant. Regardless, it's easiest to check the controls inside first. Does the blower fan work? Does the air flow change from floor to vent, to dash as it's supposed to? Does the A/C change temps when knob is turned from cold to hot? Post results.

blower motor relay or resistor needs replaced

new heater rad needed

All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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try blowin out the lines trash in them sounds like it

Check heater blower motor fuse,
Check operation of blower motor control relay,
Check blower motor not faulty- will run if 12V power directly applied to it.

if its work in only low speed u have to replace the blower motor resstor which located close to the blower
let me know have a good one

It will burn out. Air flow in the heater box cools the resistor. These resistors get very hot when the blower is running.

My daughter has a 99 Beetle GL and the A/C and fan went out. It's the A/C haeadunit that needed to be replaced. The switches short out and you have to replace the whole piece. VW charges about $225 for the part Hope that helps